Elevated Temperature Fatigue Crack Growth in a Nickel Base Superalloy Under Dwell Conditions

Byrne, J.; Hall, Richard F.; Alabraba, M.; Grabowski, L.; Hussey, I.W.

doi:10.1016/b978-0-08-037890-9.50454-3

Cited by 7 publications

(6 citation statements)

References 2 publications

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“…This is particularly relevant in the mixed time/cycle‐dependent regime where micromechanisms may include oxidation and fatigue–creep interaction at intermediate temperatures. The effect of cyclic frequency on crack growth behaviour at elevated temperature has been the subject of many researches 2 –11 . The existence of cycle‐, time‐ and mixed time/cycle‐dependent behaviour in frequency domain was first noted by Solomon 3 who composed what was described as a mechanism map for an iron‐based superalloy A286.…”

Section: Introductionmentioning

confidence: 99%

“…Extensive research has been carried out on Inconel 718 2 , 4 , 6 for which mechanism maps are available 2 . Effects of frequency on crack growth behaviour have also been studied in some nickel‐based alloys, including AP1, 7 Rene’95 8 and Waspaloy, 9 –11 although few attempts have been made to generate complete mechanism maps, possibly due to the limitations of the experimental methods adopted. In general, the change in crack growth rate reflects the characteristics of the material for a given testing condition.…”

Section: Introductionmentioning

confidence: 99%

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Effects of frequency on fatigue crack growth at elevated temperature

Tong

Byrne

1999

Fatigue Fract Eng Mat Struct

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The effects of frequency on fatigue crack growth behaviour have been studied in a prealloyed powder material, Udimet 720Li, at 650 °C. Fracture mode and fatigue crack growth behaviour were studied at frequencies ranging from 0.001 to 5 Hz using a balanced triangular waveform. Tests were carried out under constant ΔK control, with load ratio and temperature being held constant. A mechanism map was constructed where predominantly time, mixed and cycle‐dependent crack growth behaviour were identified. The results were verified by SEM analyses. Cycle‐dependent crack growth data were obtained at room temperature, while fully time‐dependent crack growth data were generated under sustained loads at 650 °C. It was found that mixed time/cycle‐dependent behaviour is of most significance for this material at the temperature and frequencies studied. Data for other nickel‐based superalloys from various sources in the literature were compiled and compared with those of U720Li alloy at a given stress intensity and temperature in the mixed regime. An analysis was developed to rationalize the observed effect of frequency on fatigue crack growth rate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of frequency on fatigue crack growth at elevated temperature

Tong

Byrne

1999

Fatigue Fract Eng Mat Struct

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“…Solomon [9] was the first to report the existence of these three regimes. They have been observed in other nickel base superalloys (AP1 [10], René 95 [11], Inconel 718 [12,13], Waspaloy [14] and Udimet 720 [15]).…”

Section: Introductionmentioning

confidence: 81%

Identification of fatigue crack propagation modes by means of roughness measurements

Antunes

Ramalho

Ferreira

2000

International Journal of Fatigue

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This paper is a study of the applicability of fracture surface roughness measurements to identify the crack propagation mode in nickel base superalloys (transgranular, intergranular or mixed). The results obtained indicated that this technique can be used as an alternative or as a complement to standard fractography. The best roughness parameters for identifying the crack propagation mode are average roughness, mean roughness depth and mean height profile peak (R a , R z and R pm). Analysis of roughness spectra in terms of the frequency range showed that the amplitude values of the profiles with wavelengths identical to the grain size are significant when propagation is intergranular. The roughness measurements were used to study the influence of loading frequency and stress state on the fatigue crack propagation mode occurring in Inconel 718 tested at 600°C.

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“…where f is the yield function, Z and n are viscous parameters and functions of temperature T; and the sign function and the bracket are defined by: (4) According to the von Mises yield criterion, the yield function f is defined as:…”

Section: The Materials Model and Parameter Determination 21 The Constitutive Modelmentioning

confidence: 99%

“…Considerable effort has been made towards an understanding of crack growth behaviour of nickel-based superalloys at elevated temperature under fatigue and fatigue-creep loading conditions, where creep, fatigue and oxidation may contribute concurrently to damage. Many studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14] have been carried out on aspects of the subject, particularly the effects of loading variables [1][2][3][4][5][6]10] and environment [7][8][9][10]. More recent published work concerns with the performance of a new generation of superalloys developed using powder metallurgy (PM) technique [6,10].…”

Section: Introductionmentioning

confidence: 99%

Near-tip strain ratchetting and crack growth at elevated temperature

Tong

Cornet

Lin

et al. 2016

International Journal of Fatigue

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In this work, we have extended our earlier work on the concept of ratchetting strain as a crack driving force (Tong et al, Int J Fatigue, 2014), to examine the crack growth of a nickel-based superalloy at selected temperatures in vacuum under both fatigue and fatigue-creep loading conditions. The parameters of a unified constitutive model were calibrated against the material data obtained at selected temperatures from 550 to 775°C, and a finite element model was developed to simulate the near-tip stress-strain responses under fatigue and creep-fatigue loading conditions at the experimental temperatures. Both ratchetting strain and accumulated inelastic strain near the crack tip were utilised in the prediction of the crack growth rates collected in vacuum. It seems that, although both ratchetting strain and accumulated inelastic strain correlate with the crack growth rates obtained under fatigue and fatigue-creep loading conditions, the predictions based on accumulated plastic strain are particularly close to the experimental results at all temperatures and loading conditions examined. This is the first time the concept of ratchetting strain has been used to predict the crack growth rates of an engineering alloy at elevated temperature in vacuum, where the influence of oxidation on crack growth is removed.

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Elevated Temperature Fatigue Crack Growth in a Nickel Base Superalloy Under Dwell Conditions

Cited by 7 publications

References 2 publications

Effects of frequency on fatigue crack growth at elevated temperature

Effects of frequency on fatigue crack growth at elevated temperature

Identification of fatigue crack propagation modes by means of roughness measurements

Near-tip strain ratchetting and crack growth at elevated temperature

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